443 Area Code
The 443 area code is serving the eastern half of Maryland, including the Baltimore metropolitan area and the Eastern Shore.
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State Data
County Data
City Data
The 443 area code is serving the eastern half of Maryland, including the Baltimore metropolitan area and the Eastern Shore.
Federal Data
State Data
County Data
City Data
Area code 443 covers the eastern half of Maryland, encompassing both the Baltimore metropolitan area and the Eastern Shore region.
Area code 443 is an overlay to area code 410, covering the same geographic region. Area code 410 was introduced in 1991, and area code 443 was added in 1997. Area code 667 was later added as another overlay. Ten-digit dialing is required within this region.
Area code 443 is a general purpose code which was placed in service on June 1, 1997.
Our Maryland phone number lookup service will analyze the three-digit prefix of any 443 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, Maryland geographic region, and local calling area associated with the phone number.
Phone numbers follow the following structure under the North American Numbering Plan:
Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.
| Company | Number of Prefixes |
|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 81 |
| SPRINT SPECTRUM, L.P. | 60 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 59 |
| VERIZON MARYLAND, INC. | 44 |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 34 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 33 |
| CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | 28 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | 26 |
| XO MARYLAND, LLC | 25 |
| US LEC OF MARYLAND, INC. | 23 |
| GLOBAL CROSSING LOCAL SERVICES, INC. - MD | 18 |
| PAETEC COMMUNICATIONS, INC. - MD | 15 |
| COMCAST IP PHONE, LLC | 9 |
| CTC COMMUNICATIONS CORP. - MD | 9 |
| CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | 5 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 5 |
| AT&T - LOCAL | 3 |
| LEVEL 3 TELECOM OF MARYLAND, LLC - MD | 3 |
| ONVOY, LLC - MD | 3 |
| BANDWIDTH.COM CLEC, LLC - MD | 2 |
| CORE COMMUNICATIONS, INC.- MD | 2 |
| ATX TELECOMMUNICATIONS SERVICES, LTD. | 1 |
| BROADVIEW NETWORKS, INC. - MD | 1 |
| BROADWING COMMUNICATIONS, LLC - MD | 1 |
| CENTURYLINK COMMUNICATIONS, LLC | 1 |
| INTRADO COMMUNICATIONS, LLC | 1 |
| LOCAL ACCESS LLC - MD | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 1 |
| OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 1 |
| VDL, INC. DBA GLOBAL TELECOM BROKERS - MD | 1 |
| YMAX COMMUNICATIONS CORP. - MD | 1 |
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.
| Rate Center | Number of Prefixes |
|---|---|
| BALTIMORE | 139 |
| ANNAPOLIS | 32 |
| COLUMBIA | 27 |
| TOWSON | 25 |
| CATONSVL | 19 |
| GLENBURNIE | 19 |
| BEL AIR | 16 |
| SALISBURY | 16 |
| PIKESVILLE | 14 |
| ELKTON | 9 |
| ESSEX | 9 |
| ABERDEEN | 8 |
| EASTON | 8 |
| PARKVILLE | 8 |
| WESTMINSTR | 8 |
| EDGEWOOD | 7 |
| FALLSTON | 7 |
| PRINCEFRCK | 7 |
| COCKEYSVL | 6 |
| ELLICOTTCY | 6 |
| SYKESVILLE | 6 |
| WOODLAWN | 6 |
| ARBUTUS | 5 |
| CAMBRIDGE | 5 |
| ELKRIDGE | 5 |
| SEVERN | 5 |
| SEVERNA PK | 5 |
| WATERLO238 | 5 |
| RANDALLSTN | 4 |
| ARGRGBSNIS | 3 |
| BRYNPKLNCM | 3 |
| CHESTERTN | 3 |
| CROFTON | 3 |
| FORK | 3 |
| NORTHBEACH | 3 |
| REISTERSTN | 3 |
| BERLIN | 2 |
| CARDIFF | 2 |
| CENTREVL | 2 |
| CHASE | 2 |
| DELMAR | 2 |
| DUNDALK | 2 |
| HAMPSTEAD | 2 |
| HAVREGRACE | 2 |
| OCEAN CITY | 2 |
| PERRYVILLE | 2 |
| SOLOMONS | 2 |
| SPARROWSPT | 2 |
| WATERLO236 | 2 |
| WEST RIVER | 2 |
| CHESAPKECY | 1 |
| CHURCHVL | 1 |
| DARLINGTON | 1 |
| DENTON | 1 |
| NORTH EAST | 1 |
| ODENTON | 1 |
| SHARPTOWN | 1 |
| SILVER RUN | 1 |
| SPARKSGLNC | 1 |
| STEVENSVL | 1 |
| UNION BDG | 1 |
| WORTHINGTN | 1 |
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